CVE-2024-26810 Information

Description

In the Linux kernel the following vulnerability has been resolved:

vfio/pci: Lock external INTx masking ops

Mask operations through config space changes to DisINTx may race INTx configuration changes via ioctl. Create wrappers that add locking for paths outside of the core interrupt code.

In particular irq_type is updated holding igate therefore testing is_intx() requires holding igate. For example clearing DisINTx from config space can otherwise race changes of the interrupt configuration.

This aligns interfaces which may trigger the INTx eventfd into two camps one side serialized by igate and the other only enabled while INTx is configured. A subsequent patch introduces synchronization for the latter flows.

Reference

https://git.kernel.org/stable/c/3fe0ac10bd117df847c93408a9d428a453cd60e5 https://git.kernel.org/stable/c/04a4a017b9ffd7b0f427b8c376688d14cb614651 https://git.kernel.org/stable/c/6fe478d855b20ac1eb5da724afe16af5a2aaaa40 https://git.kernel.org/stable/c/03505e3344b0576fd619416793a31eae9c5b73bf https://git.kernel.org/stable/c/810cd4bb53456d0503cc4e7934e063835152c1b7